He can watch over you best and looks his most majestic when perched on a shelf above eye-level.
To compare all three sizes click here
Small 9.5" Sentinel, $49.50 ($45.00 + $4.50 S&H,US)
Medium 20" Sentinel, $169.00 ($150.00 + $19. S&H,US)
Large 43" Sentinel, $957.00 ($899.00 + $58. S&H,US)

(Best pronounced with a shoulder shrug as if you've been tapped there by a very annoying person)You might want to display him as a visual cue when you don't want to be disturbed by pesky co-workers.
$32.50 ($28.00 + $4.50 S&H,US)